curl --request GET \
  --url https://api-next.ofauth.com/v2/access/statistics/visitor-countries/chart \
  --header 'apiKey: <api-key>'

{
  "isAvailable": true,
  "chart": {
    "visitors": [
      {
        "date": "<string>",
        "count": 123
      }
    ],
    "duration": [
      {
        "date": "<string>",
        "count": 123
      }
    ]
  },
  "total": {
    "current": "<string>",
    "delta": 123
  },
  "hasStats": true
}